Search found 3122 matches

by thschrader
Sun Mar 17, 2024 5:53 pm
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

I do not really understand the triaxiality concept. When doing a hand calculation (with stress/strain tensors at yellow "X") I get a very low triaxiality, as to expect, nearly pure shear. PEEQ is 5%, analog to IdeaStatica the plastic limit is reached. In the end I get a epsilon_cr of 32%. ...
by thschrader
Thu Mar 14, 2024 4:31 pm
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

Just updated the fcVM-wb, nice! @HarryvL : For me the point is, that I can run a linear analysis. If the stresses exceeding the limit fy, start fcVM and do the nonlinear analysis. Which btw runs much faster than ccx with nonlinear options. My loads allready contain the safety-factors from the static...
by thschrader
Wed Mar 13, 2024 2:12 pm
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

Just updated the fcVM-wb. I found this interesting article about the triaxiality concept: https://publications.vtt.fi/julkaisut/muut/2016/VTT-R-04741-16.pdf What gives me a headache is the wide range of alpha-values in table 4, used for EQ.4. Since the loading in my FEM-model contains allready the s...
by thschrader
Mon Mar 11, 2024 9:25 am
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

fcVM compared to ideastatica. ideastatica uses a bilinear material model: https://www.ideastatica.com/de/support-center/materialmodell Cut of criterion for max plastic strain is 5% (default). HEA-200 frame under 25 kNm momentum loading, steel S235: As you can see from the curves, both calculations g...
by thschrader
Sat Mar 09, 2024 10:43 pm
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

At the beginning of the year, the 4 m mast fell from the platform and hit a building below the platform. Our company was at the site years ago. The original construction was over 15 years ago, carried out by another company. My task was to show that even under the new wind loads a fall is unlikely. ...
by thschrader
Sat Mar 09, 2024 6:19 pm
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

Here is another one: Anchor plate of a small antenna mast. The mast is boltet on a platform of a huge concrete tower, location Föhr island, north sea. I like the plotting of the "capacity-curves", you can see immediatly the huge difference between linear elastic/plastic calculation. Design...
by thschrader
Sat Mar 09, 2024 11:32 am
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

Works here too: ... Looks like the stiffening is very effective. Behaves like fully clamped tube. Did you try mesh refinement to check the results converge? No. For a project like this (doing the statics for a new cellphone base station) I have 12 hours. This includes all discussions with the custo...
by thschrader
Sat Mar 09, 2024 10:43 am
Forum: CfdOF / CFD
Topic: Modeling 3D part cooling duct airflow?
Replies: 2
Views: 270

Re: Modeling 3D part cooling duct airflow?

Here is a quick 2D-example. Welcome to the forum. 2D_example.FCStd Screenshot 2024-03-09 113939.png OS: Windows 10 Version 2009 Word size of FreeCAD: 64-bit Version: 0.20.2.29177 +426 (Git) Build type: Release Branch: (HEAD detached from 0.20.2) Hash: 930dd9a76203a3260b1e6256c70c1c3cad8c5cb8 Python ...
by thschrader
Sat Mar 09, 2024 9:43 am
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

Just updated the fcVM-wb, new installation now on Windows 11, intel i7, 16 GB RAM. On this machine there is no need to fix the "black sreen" issue. fcVM runs fine. Questions: In the displacement plot the load factor means, that the forces Q,N,V1/V2 (V1+V2 representing the moment) are multi...
by thschrader
Thu Mar 07, 2024 8:08 am
Forum: FEM
Topic: fcVM workbench
Replies: 80
Views: 5417

Re: fcVM workbench

Nice, it works. 8-) @HarryvL : great job, Sir! Lets play with it... System Windows 10 pro, Intel Pentium 3,3 GHz, 16 GB-Ram OS: Windows 10 build 19045 Word size of FreeCAD: 64-bit Version: 0.21.2.33771 (Git) Build type: Release Branch: (HEAD detached at 0.21.2) Hash: b9bfa5c5507506e4515816414cd27f48...